John t



. uithtstrs ggimf @frn IMPROVED STALL FOR RQASTING ORES GONIAINING SULPHUR, dre.

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TO ALL WHOM IT MAY CONCERN:

Bc' it knownI that I, JOHN T. REESE, of Baltimore, in the county ot` Baltimore, in the State ofhIaryland, have invented a new and improved Stall for the 'Purpose oF Roasting Orcs Containing Sulphur, Arsenic, Antimony, and other minerals that are detrimental to the work of' snielting their chief metal, and, at the same time, so to conduct the gases thence arising, througlra series ot' ports and culverts, as to collcct'the injurious minerals in sediment, and utilize the saine; and I do hereby declare that the following is a full andexact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon, forming a part of this speeication, which- Figure 1 is a front elevation of ore stall.

Figure 2 is-a sidevview. I

Figure 3 is a top view.v

Figure 4 is a ground plan of main culvert. l

Figure 5 is a ground plan of another form ot' main culvert. v

. In the drawings, a is an arch, which forms the entire roof of the stall; b Z1 are the doors; c c are the draught channels; dd are draught ports; e c are the lower'fume ports; f is the upper fume port; s is the stall stack; h is the stall culvert; Ic k are charge ports. In small stalls the draught channels and draught ports c e Z may be omitted.

Operation.' I

The fuel is placed upon the floor of the stall, which is then charged with orc through the ports c 7c. These ports and the doors b are then closed, and the charge is tired in lfront. A suicient draught'is aiforded in front by the Open space below the doors, and at the sides by admitting air` through the channels c e, and thence through the ports dd. As the fumes arise from the mass of roasting ore, the roof a prevents their escape, and they pass through the ports e e and j' to the stack `s and culvert h, and thence, through a; branch culvert, as at z', .to the main culvert and main stack. In its passage through the main culvert the numerous bends, whether forming obtuse angles, as showt in iig. 4, or more abrupt turns, asshown in fig. 5,"and rough surfaces ont' its walls, as shown at r, tig. 5, or obstructions placed directly across the culvert in the form of iron vgrates or wire cloth, all serve to collect the valuable sediment from the fumes, therebj preventing them from poisoning the atmosphere, besides turning them to pecuniary advantage. By this processthe roasting is thorough, saving a large perc entage, in cost of. furnace roofs, of labor, of fuel, in time and processes of the subsequent smelting of the ore, together' with again of fty per cent., or more, in thel purity and value of the metal produced over and above that produced by the old process of roasting, while a. 'saving of more than fifty per cent. in cost of stalls, and

, eighty-tive per cent. in fuel, is effected in this process of roasting alone. In the old process ot' roasting, the

stall has no doors nor roof. Its walls were perforated from top to bottom, the holes either serving to admit air or. discharge 'the fumes, as. controlled by the currents of hot orl cold air and gases, whilethe escape of fumesv poisoned the atmosphere, and wasted the volatile but valuable minerals.

Claims.

WhatI claim as my invention, and'desire to secure by Letters Patent, is

An ore stall with aroof, a, by arch or otherwise; a closed front by doors b b; the arrangement of draught ports d d; the arrangement of fume ports e e and f; the connection of stack s and culvert t with culvert z' and main culvert and stack; this process of confined roasting; a long and crooked main culvert; and the process of securing sediment b 'y the bends, the rough walls, or the obstructions in the eulverts.

JOHN lI. REESE.

Witnesses:

THOMAS Monats, DAVID Monats. 

